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(1) Tested Very Strong RCA 6AK6 Tube with Box Code NHK Power Amplifier Pentode (a)

(1) Tested Very Strong RCA 6AK6 Tube with Box Code NHK Power Amplifier Pentode (a)

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(1) Tested Very Strong RCA 6AK6 Tube with Original Box.
Date Code NHK.

The wording is slightly worn but still legible. 
The box shows areas of scuffing.

Tested on a calibrated Hickok TV-10 military tube tester with no shorts and no leaks with the following results:

Gm Test = 2600 micromhos
Minimum pass/good = 1320

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